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Full Discussion: TCP Packet size
Special Forums IP Networking TCP Packet size Post 302523862 by olle on Friday 20th of May 2011 04:21:03 AM
Old 05-20-2011
Quote:
Originally Posted by DGPickett
Maybe it has an MTU of less. Obsolete IP option 12 can send this during connect without the ICMP of PATH MTU Discovery.

The MSS is the total remote buffer, the MTU is the packet max. Disregarding the chance of TCP options, a packet header is 20 IP + 20 TCP, so a packet sends MTU - 40, and the number of packets sent before ack is MSS/(MTU-40) including any partial. Since this is local, the ack round trip should be very short, so packets should not be MSS trimmed unless there is blocking downstream.
Thanks for your support.

Well, I don't find anything in the IP header(s) which looks like IP option 12. Have attached a small wireshark dump, if you would like to have look though.

If it is to any help, the MTU of the interface at my host machine is set to 1500. And regarding the chip, I know it can handle a MTU of 536 + headers, as I can see the Windows application send it packets of this size (from the same machine too).
 

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rdt_setmtu(1M)						  System Administration Commands					    rdt_setmtu(1M)

NAME
rdt_setmtu - set the MTU size in RSMRDT driver SYNOPSIS
/usr/cluster/bin/rdt_setmtu [MTU size] DESCRIPTION
The rdt_setmtu command takes number of bytes as new MTU size and sets the global MTU size in RSMRDT driver. The RSMRDT driver uses the new MTU size for all the new instantiations of RSM connections. The existing RSM connections continue to use the old MTU size value. The MTU size should be a multiple of 64(0x40) bytes otherwise rdt_setmtu does not set the MTU size in RSMRDT driver and returns an error. The rdt_setmtu when running without any argument, displays the MTU size of RSMRDT driver. You can use this command only in the global zone. OPERANDS
The following operands are supported: MTU size MTU size in bytes. EXIT STATUS
The following exit values are returned: 0 Successful completion. 1 An error occurred while setting MTU size. This utility writes an error message to stderr when it exits with non-zero status. ATTRIBUTES
See attributes(5) for descriptions of the following attributes. +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscrdt | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5) Sun Cluster 3.2 30 Mar 2006 rdt_setmtu(1M)
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